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Page 76 / 86 Scroll up to view Page 71 - 75
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9 •
Wireless Pages
75
Configuring a Wireless Client for WEP
If you enabled WEP and set a key by configuring WEP on the SBG901, you must
configure the same WEP key on each wireless client. The SBG901 cannot authenticate a
client if:
•
Shared Key Authentication is enabled on the SBG901 but not on the client
•
The client WEP key does not match the SBG901 WEP key
For all wireless adapters, you must enter the 64-bit or 128-bit WEP key generated by the
SBG901.
CAUTION:
Never provide the WEP key to anyone who is not authorized
to use your WLAN.
Configuring a Wireless Client with the Network Name
(SSID)
After you specify the network name on the Wireless Primary Network Page, many
wireless cards or adapters automatically scan for an access point, such as the SBG901
and the proper channel and data rate. If your card requires you to manually start scanning
for an access point, do so following the instructions in the documentation supplied with
the card. You must enter the same SSID in the wireless configuration setup for the
device to communicate with the SBG901.
Page 77 / 86
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Troubleshooting
76
10
Troubleshooting
If the solutions listed here do not solve your problem, contact your service provider.
Before calling your service provider, try pressing the Reset button on the rear panel of
the SBG901. Resetting the SBG901 may take five to 30 minutes. Your service provider
may ask for the status of the lights as described in
Front-Panel LEDs and Error
Conditions
.
Solutions
Table 1 – Troubleshooting Solutions
Problem
Possible Solution
Power light is off
Check that the SBG901 is properly plugged into the electrical outlet.
Check that the electrical outlet is working.
Press the Reset button.
Cannot send or
receive data
On the front panel, note the status of the LEDs and refer to
Front-
Panel LEDs and Error Conditions
to identify the error. If you have
cable TV, check that the TV is working and the picture is clear. If you
cannot receive regular TV channels, the data service will not function.
Check the coaxial cable at the SBG901 and wall outlet. Hand-tighten
if necessary.
Check the IP address. Follow the steps for verifying the IP address
for your system described in
Configuring TCP/IP
. Call your service
provider if you need an IP address.
Check that the Ethernet cable is properly connected to the SBG901
and the computer.
If a device is connected via the Ethernet port, verify connectivity by
checking the LINK LEDs on the rear panel.
Page 78 / 86
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Troubleshooting
77
Problem
Possible Solution
Wireless client(s)
cannot send or receive
data
Perform the first four checks in “Cannot send or receive data.”
Check the Security Mode setting on the Wireless Primary Network
Page:
•
If you enabled WPA and configured a passphrase on the SBG901,
be sure each affected wireless client has the identical passphrase.
If this does not solve the problem, check whether the wireless
client supports WPA.
•
If you enabled WEP and configured a key on the SBG901, be sure
each affected wireless client has the identical WEP key. If this
does not solve the problem, check whether the client’s wireless
adapter supports the type of WEP key configured on the SBG901.
•
To temporarily eliminate the Security Mode as a potential issue,
disable security.
After resolving your problem, be sure to re-enable wireless security.
•
On the Wireless Access Control Page, be sure the MAC address
for each affected wireless client is correctly listed.
Slow wireless
transmission speed
with WPA enabled
On the Wireless Primary Network Page, check whether the WPA
Encryption type is TKIP. If all of your wireless clients support AES,
change the WPA Encryption to AES.
Front-Panel LEDs and Error Conditions
The SBG901 front panel LEDs provide status information for the following error
conditions:
Table 2 – Front-Panel LEDs and Error Conditions
LED
Status
If, During Startup:
If, During Normal Operation:
POWER
OFF
SBG901 is not properly plugged
into the power outlet
The SBG901 is unplugged
RECEIVE
FLASHING
Downstream receive channel
cannot be acquired
The downstream channel is lost
SEND
FLASHING
Upstream send channel cannot be
acquired
The upstream channel is lost
ONLINE
FLASHING
IP registration is unsuccessful
The IP registration is lost
Page 79 / 86
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A •
Product Specifications
78
A
Product Specifications
All features, functionality, and other product specifications are subject to change without
notice or obligation.
Certain features may not be activated by your service provider and/or their network
settings may limit the feature’s functionality. Additionally, certain features may require a
subscription. Contact your service provider for details. All features, functionality, and
other product specifications are subject to change without notice or obligation.
GENERAL
Standards
Cable Interface
Network Interface
Wireless Interface
Dimensions
Interoperates with DOCSIS
F-connector, female, 75 Ω
One 10/100 Ethernet port
802.11b/g Wi-Fi
146 mm x 146 mm x 38 mm
(5.7 in x 5.7 in x 1.5 in)
INPUT POWER
North America
Outside North America
105 to 125 VAC, 60 Hz
90 to 264 VAC, 45 to 65 Hz
ENVIRONMENT
Operating Temperature
Storage Temperature
Operating Humidity
0° C to 40° C (32° F to 104° F)
–30° C to 70° C (–22° F to 158° F)
0 to 95% R.H. (non-condensing)
DOWNSTREAM
Modulation
Maximum Data Rate*
Bandwidth
Symbol Rates
Operating Level Range
Frequency Range
Input Impedance
64 or 256 QAM
38 Mbps (256 QAM at 5.361 Msym/s)
6 MHz
64 QAM at 5.069 Msym/s, 256 QAM at 5.361 Msym/s
–15 to 15 dBmV
88 to 860 MHz
75 Ω (nominal)
*When comparing download speeds with a traditional 28.8k analog modem. Actual speeds will
vary and are often less than the maximum possible. Several factors affect upload and download
speeds, including, but not limited to, network traffic and services offered by your cable operator
or broadband service provider, computer equipment, type of service, number of connections to
server, and availability of Internet route(s).
Page 80 / 86
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Product Specifications
79
UPSTREAM
Modulation
Maximum Channel Rate
Bandwidth
Symbol Rates
Operating Level Range
A-TDMA
S-CDMA
Output Impedance
Frequency Range
8***, 16, 32***, 64***,128*** QAM or QPSK
30 Mbps**
200 kHz, 400 kHz, 800 kHz, 1.6 MHz, 3.2 MHz, 6.4 MHz***
160, 320, 640, 1280, 2560, 5120*** ksym/s
8 to 54 dBmV (32, 64 QAM),
8 to 55 dBmV (8, 16 QAM) ,
8 to 58 dBmV (QPSK)
8 to 53 dBmV (all modulations)
75 Ω (nominal)
5 to 42 MHz (edge to edge)
5-65 for Euro-DOCSIS
**Actual data throughput will be less due to physical layer overhead (error correction coding,
burst preamble, and guard interval).
***With A-TDMA or S-CDMA enabled Cable Modem Termination System (CMTS).
NETWORK
Gateway
Wireless LAN
Power Management
802.11i Security
Mobile Pairing
Regulatory Domains
Transmit Power Output
IEEE 802.11b
IEEE 802.11g
Receiver Sensitivity
DHCP, NAT; static routing and dynamic IP routing (RIPv1,
RIPv2); SPI firewall with DoS protection and intrusion
prevention; port, packet, and URL keyword filtering; full suite of
ALGs; UPnP IGD 1.0
802.11b/g Wi-Fi, two internal antennas, WDS bridging, 802.11e
WMM admission control, QoS
802.11e WMM power save/U-APSD (Unscheduled-Automatic
Power Save Delivery)
WEP-64/128, WPA-PSK, WPA, WPA2, TKIP, AES, 802.1x,
802.11i (pre-authentication)
User-friendly Wi-Fi–protected setup (WPS) for secure mobile
pairing with compatible dual-mode handset
To include US, Canada, ETSI, World
19 dBm +1/–1.5 dB at all rates in all channels
16 dBm +1/–1 dB at 54 Mbps in all channels
> –90 dBm at 11 Mbps;
> –74 dBm at 54 Mbps

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